No end of writing experts (4)
I believe the answer is:
pros
'experts' is the definition.
(I've seen this in another clue)
'no end of writing' is the wordplay.
'no end of' means to remove the last letter.
'writing' becomes 'prose' (ordinary writing as opposed to poetry).
'prose' with its last letter removed is 'PROS'.
(Other definitions for pros that I've seen before include "Yes votes" , "Persons with knowledge and skill" , "Arguments in favour" , "Sportsmen who are paid" , "Positive arguments" .)